Water-and-waste-water Questions Set 8:
What is the highest form of decontamination?
Solution:
What is the typical ratio of the rate of backwashing to the rate of filtration in a rapid sand filter?
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A circular sewer of diameter 1 m carries storm water to a depth of 0.75 m. The hydraulic radius is approximately:
Solution:
Temporary hardness in water caused by the presence of
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Which of the following chemicals is commonly used for dechlorination of water?
Solution:
Some of the nontoxic metals normally found in natural water are:
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Which is a chamber made of concrete, fiberglass, PVC or plastic, through which domestic wastewater or sewage flows for primary treatment?
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Which one of the following BOD/COD ratio pairs is not correctly matched?
Solution:
Match the following List I to List II:
List I:
i. Primary clarifier
ii. Grit chamber
iii. Trickling filter
List II (Impurities to be removed):
1. Suspended inorganic matter
2. Dissolved organic matter
3. Suspended organic matter
4. Large floating matter
Solution:
A synthetic sample of water is prepared by adding 100 mg of Kaolinite (a clay mineral), 200 mg of glucose, 168 mg of NaCl, 120 mg of MgSO4, and 111 mg of CaCl2 to 1 liter of pure water. What are the concentrations of total solids (TS) and fixed dissolved solids (FDS) in the solution in mg/L?
Solution:
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